Vacuum-feeding device for carburetors



F. V. RISINGER. VACUUM FEEDING DEVICE FOR CARBURETORS.

APPLICATION FILED JULY 5 I920.

2 SHEETS SHEET 3.

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DING DEVICE FOR CARQURETORS. APPLICATION FILED JULY 1929 VACUUM FEE Patented Oct: 24, 1922 2 SHEETSSHEET 2.

Below the bottom plate, 15, there is mounted a reserve fuel supply chamber, 18, into which the passage in common, 15 from the chambers, 1 and 1, discharges, said discharge passage being entirely free of any valve obstruction or the like. This reserve fuel supply chamber has a discharge connection shown at 18, by which the liquid contents of said reserve chamber may be supplied to the carburetor by gravity flow. It will be noted that the arrangement of the valve, 16, seating at the passages, 15 and 15, one at a time, leaving the other open, and the construction and modeof operation of the suction and atmosphere valves of the chambers, 1 and 1 insures that there shall always be atmospheric pressure operating either through one or the other of said chambers, 1*, 1", and the outflow assages therefrom to the reserve fuel suppy chamber, 18; so that outflow by gravity from the said chamber, 18, can occur at any time that there is liquid in that chamber to "be discharged.

The mode of operation of this structure .may beunderstood from the foregoing description', but may be further indicated in detail as follows:

Assuming the chambers to be both empty. connections made from 6' to a source of suction, and from the pipe, 9, to a source of liquid sup ly, both the suction valves, 3' and 3", an 'both the atmosphere valves, 6" and 6, may be partly open; but the valve, 8

will be seated at the outflow portof one ofthe chambers, as for example, the chamber, 1", and the outflow port of the outer chamber, 1 will be open; and upon the admisl sion of suction, the greater freedom of air 40 inlet through the chamber, 1 air being freely admitted both past the air valves, 6' or 6, and through the liquid outlet passage of said. chamber, 1",w1ll cause the suction valve.3", of said other chamber, 1, to be closed; and thereupon, suction operating in the chamber, 1, W111 cause it to fill with liquid lifted from the main low level supply chamber until the liquid level rises in said chamber, 1, so far las to lift the float, 2, which will lift the suction valve, 3, so near to its seat that it will be pulled to \its seat by the suction. In reaching its seat, the valve will' pull the float a little above the level to which it has up to that point been buoyed by the liquid, bringing it up against the lower end (iii-lie stem of the atmosphere valve, 4". If that valve is not thereby opened,.the partial vacuum already existing in the chamber, 1", will cause the further continuous inflow of liquid to a certain extent, further buoying the float, 2, sufliciently vto enable it to force the air valve, 4 ,01? its seat against the slight resistance of the springs, 10', interposed below the stop, 10, and the resistance of the atmosphere due to to the partial vacuum still'remaining in the chambenl, the rise of the float upon break- 1 .pheric pressure to cause the discharge of the liquid by gravity from the chamber, 1, which will reverse the position of the valve, 16, throwing it over in position to close the liquid outflow passage from the chamber, 1. Also the rise of the valve, 3, to its seat freeing the lever, 6, will leave the valve, 3", free to descend, as it will do at once upon the operation of the full unsupported Weight of the float, 2 whereupon the air valve, 6, moving to closed position, suction being operative to produce partial vacuum in the chamber, 1", that chamber will become filled with liquid while. the chamber, 1, is emptying, and the operations above described with respect to the chamber, 1*, will be repeated with respect to the chamber, 1*; and alternation of these two operations between the two chambers will continue until the fuel reserve chamber, 15, becomes filled and the li uid rises first in the chamber, 1 or 1",-w ichever happens at that time to be in process of fillin -to the float-operating evel; and upon't e reversion of the valves above described, shifting the suction to the other chamber, that chamber will be filled, the first filled chamber in the meantime remaining filled because it can no longer discharge into the already filled fuel reserve chamber, 15; and thus eventually,'not only the fuelreserve chamber but both the'c'hamhers, I and 1, will be filled to the float-opcrating level; and thereupon the device will chainber,-while, if there is still unfilled capacity in the fuel reserve chamber, the other vacuum chamber is emptying; and the cycle of operation as above described is thus resumed, and continued so long as there is maintenance of suction and unfilled ca acity in the reserve chamber.

t should be noted that Whereas, in the initial operation of the device, starting from condition of emptiness of all chambers, the "full weight of the float'in the second vacuum chamber to be filled is operative for revers- 'ing the valve situation as soon as the liquid rises in the first filling chamber so as to buoy the float therein, the situation is not identically the same in subsequent operation, because, it, may happen that the li uid level hasl not receded in the chamber w ich was first filled, soas. to completely unsubmerge the float therein, that is, to leave it entirely above the liquid and its whole weight operative,b v the time the liquid has risen in the other chamber so as to reach and begin to bilo the float: the parts are so proportioned that the valves will be operated as described against the suction tending to hold them on their seat against their weight. by the co-operat-ion of the two floats. the operative weight of one to the extent that it is unsubmerged being assisted by the buoyancy of the other to the extent that it is submerged. V

The purpose of the light coiled springs, 18. 1S, interposed between the floats. 2 and 2 and the upper stops on the stems, 10 and 10", is primarily and chiefly to prevent dis turbance of the position of the suction valves, 3 and 3", by the jarring of the device in travel.

It will be observed that under conditions of high suction and small consumption of fuel by the engine, causing rapid inflow of liquid and limited outflow, the reserve fuel supply chamber, 18, may become filled the liquid rising in the vacuum chamber to the high liquid level indicated by the line, X-X, on Figure 1. If under such conditions, or under any conditions in which the reserve fuel supply chamber is filled and there is liquid in one or the other or both of the vacuum chambers, the device becomes over-heated t0 the boiling point of the liquid, all danger of discharge of the gasoline by boiling and expansion is prevented by reason of the fact that vapor or liquid expansion from all the chambers will find free accommodation. one or the other of the outflow passages to the reserve fuel chamher being open for back-flow into one or the other of the vacuum chambers and the air valve. 4: or 4,. of that chamber. being open to permit the escape of vapor from the top of the liquid in that vacuum chamber into which the contents of both the other chambers of the device can expand freely.

I claim:

In a device for the purpose indicated, a pair of chambers having a suction connection in common and a passage to which the i suction connection is made: suction ports for the two chambers respectively, opening into said passage; valve means in said chambers controlling said ports respectively for causing alternate dominance of suction and air pressure in the chamber; outflow connec tions from the chambers respectively, comprising a passage in common valve means in said outflow connection adapted to be opened by liquid outflow from and held seated by suction in the respective chambers, and means situated in said suction passage in common for correlating the action of the first mentioned valve means in the chambers for reversely operating the corresponding valves of the two chambers by the same movement.

In testimon whereof, I have hereunto set my hand at fliicago. Illinois, this 16th day of June, 1920.

FRANK V. RISINGER. 

